Wire rope.



PATENTED APR. 7, 1908.

- 0. TKNGRING.

WIRE-ROPE.

INVENTOR UNITED STATES PATENT OFFICE.

OLOF TANGRING, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO AMERICAN STEEL &WIRE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

WIRE ROPE.

To all whom it may concern:

Be it known that I, OLOF TANGR NG, of Worcester, Worcester county,Massachusetts, haveinvented a new and useful Im rove ment in Wire Ropes,of which the fol owing.

is a full, clear, and exact description, reference being had to theaccom anying drawings,

derricks. n the various operations which.

require the liftin of heavy loads, the use of a single rope attaclieddirectl to the load has long been considered desira le; but owing to thefact that with the. ordinary rope, as soon as the load is attached andis depending there from, the rope begins to rotate or s in, andconsequently to unwind, the load becomes dangerous to handle and oftenunmanageable and the strain on the fibers of the-ropeis such that it isliable to break. 'Various forms of construction of wire rope have beenproduced to obviate this spinning or rotating movement, but the presentinvention is believed to be the first to overcome the difficulties abovesuggested, and to produce a flexible and smooth rope.

The construction of the r0 e is as follows:

An inner series of wire stran s 2 is wound in one direction over a core3, and an outer series of wire strands .4 is ,wound about the innerseries 2 as a core in the opposite direction. The wires which make ueach of the individual strands 2 are twiste direction as the lay of thestrands, but in the strands 4 the individual wires are laid in o ositedirections to the lay of the stran s.

be number of strands required for the second or outer layer must ofcourse be greater than the number of strands in the inner layer. Forthis reason, the inner layer has the wires as well as the strands alllaid in one, direction, as described, thereby giving them a tendency tountwist very much faster than if they Specification of Letters Patent.

Application filed. October 4, 1907. Serial No. 895,916.

in the samev Patented April 7, 1908.

were twisted in the o osite direction to the lay of the strands. e wiresinthe outer layer being laid in an opposite direction to the lay ofthestrands do not tend'to untwi'st as fast as in the inner'layer; Thestrands in the outerlayer, however, counteract the tendency ofuntwisting of therope as a whole. When a weight is applied to the end ofthe rope, the greater number of strands vof the outer layer have atendency to untwist in one direction, whereas the fewer strands of theinner layer have a tendency to untwist ver much faster in the op ositedirection, and it is found in practice t at these two actions almostperfectly balance each other.

The core 3 ispreferably made of hemp,

but any suitable material or metal may beused. Any desired number ofwires may be used in each strand, and the core may be omitted. Thenumber of strands in the ro e depends on the size, uality and the use orwhich it is made,- a arge number of small strands giving'a much smootherand more flexiblerope than a smaller number of larger strands. In thedrawing, I have shown the inner layer made up of S12: strands composedeach of seven wires, and the outer layer is made up oftwelve strands comosed each of seven wires, butit is to be un erstood that these drawingsare more or less'dia am maticin character, and it is not intende thatthey should re resent the exact proportions and relations, or theseproportions and relations may vary widely with the conditions'of theWorkto be performed.

I claim: w

1. A wire rope having an inner series of strands wound in one direction,and an outer series of strands wound about the inner series as a corein'the' opposite direction, each of said stra1ids being composed of aplurality of wires, the Wires of the inner series being twisted or laidin the same direction as the lay of the strands in such series, and thewires of the outer 'seriesbeing laid in o posite directions to the layof the stran s in such series, substantially as described.

2. A wire rope having an inner series of strands wound about a core inone direction,

an outer series of strands Wound about the inner series as'a core 1n theopposite dlrection, each of sald strands being composed of a pluralityof wires, the wires of the inner having their individual wires laid inthe same series being twisted or laid in the same direcdirection,substantially as described. 10 tion as the lay of the strands in suchseries, In testimony whereof, I have hereunto set and the wires of theouter series being laid in my hand, 5 opposite directions to the lay ofthe strands OLOF TANGRING.

in such series, substantially as described. Witnesses:

3. A wire ro e composed of two layers of A. F. BAdKLIN,

strands woun in opposite directions and WM. A. BACON.

